Andrew Douglas Gemmell (born February 20, 1991) is an American competition swimmer who specialized in long-distance freestyle events.

[5] At the 2008 FINA Youth World Swimming Championships, Gemmell won gold in the boy's 400-meter individual medley with a time of 4:21:58.

[14] At the 2011 ConocoPhillips U.S. National Championships at Stanford, California in August 2011, Gemmell won the 1500m free while attached to the Delaware Swim Team.

[18] At the 2012 Summer Olympics in London, he placed ninth in the preliminary heats of the 1,500-meter freestyle with a time of 14:59.05, and did not advance among the top eight to the event final.

[19] Gemmell's swim of 15:31:13 was not his fastest for that year, and ranked him 21st of 97 competitors, but only the top eight finishers made the semi-final cut.

[20] At the Pan Pacific Swimming Championships on August 31, 2014, Andrew placed first in the 10 km event, at Kihei Beach at Maui, Hawaii with a time of 1:51:11.

[2] With a clear victory, his time was nearly a minute in front of Jarrod Poort of Australia, the silver medalist.

[21] On Saturday, June 28, 2014, Gemmell was unable to finish the FINA 10K Marathon Swimming World Cup, by his account due to the water temperature of 62 degrees.

[5] At the Pan American Games in 2015, Andrew won a silver medal in Toronto in the 1500 Meter freestyle in July in a time of 15:6:43.5, just three seconds behind Ryan Cochrane of Canada.

[22] In one of his last international competitions, Andrew placed 17th of 63 in the FINA World Championships on July 14, 2017, in Budapest in a 5 km swim with a time of 54:59.

[25] In the FINA World Championships on July 14, 2017, as Gemmell neared his 27th birthday at the end of his competitive career, he placed 17th of 63 in the 5 km swim in Budapest with a time of 54:59.

[2] In the fall of 2016, Gemmell planned to attend graduate studies at Georgetown University, majoring in Applied Economics, and utilizing his post-graduate scholarship funds.